给ButtonBar组件设置自定义TOOLTIP。

toolTipField 属性.
示例：

代码：
 

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2008/04/27/setting-a-custom-tool-tip-field-on-a-buttonbar-control-in-flex/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white" >

     < mx:Array  id ="arr" >
         < mx:Object  label ="Accordion"
                toolTip ="Le Accordion"
                icon ="@Embed('assets/Accordion.png')"   />
         < mx:Object  label ="ApplicationControlBar"
                toolTip ="Le ApplicationControlBar"
                icon ="@Embed('assets/ApplicationControlBar.png')"   />
         < mx:Object  label ="Box"
                toolTip ="Le Box"
                icon ="@Embed('assets/Box.png')"   />
         < mx:Object  label ="Canvas"
                toolTip ="Le Canvas"
                icon ="@Embed('assets/Canvas.png')"   />
         < mx:Object  label ="ControlBar"
                toolTip ="Le ControlBar"
                icon ="@Embed('assets/ControlBar.png')"   />
     </ mx:Array >

     < mx:ButtonBar  id ="buttonBar"
            dataProvider =" {arr} "
            labelField ="label"
            toolTipField ="toolTip"
            iconField ="icon"
            height ="32"   />

</ mx:Application >